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Sixteen year old Alice Palmer drowns while swimming with her family at a dam in Ararat, Australia. After she dies strange things start to happen around her house. It's discovered that her teen brother Matthew was actually setting up the "sightings" of his dead sister to give the family reason to exhume Alice's body and give his mother closure.

One of the hoax video tapes of Alice showed that the neighbor was in Alice's bedroom looking for something, her mother found a sex tape of the neighbor, his wife and Alice hidden in the fireplace in Alice's room.

A psychic the family had contacted finally admitted that Alice had met with him several months before her death and had told him she was having dreams about drowning, being dead and her mother not being able to see or help her. Alice's boyfriend finally comes forward with cell phone video footage showing Alice on a school trip to Lake Mungo, she is shown very upset and burying something beneath a tree.

Alice's family travels to Lake Mungo, and finds what Alice had hidden, her cell phone and a bracelet. The video footage on the cell phone shows that Alice had seen her doppelgänger walking toward her. The double appears bloated just as Alice's body had been after being recovered from the lake in the beginning of the film.

Alice's family then goes home and moves out of their house, feeling that Alice had simply wanted them to know who she really was and what she had seen. The ending of the film adds some ambiguity to whether this was truly accomplished, as the film's mid-credit scenes reveal that Alice had manifested in earlier pictures and videos, with nobody noticing.

Lake Mungo was met with critical acclaim, earning a 93% approval rating on Rotten Tomatoes.[9] Andrew L. Urban of Urban Cinefile said "This superbly constructed and executed film gets everything right, to the smallest detail, as it draws us into the imagined scenario."[10]